EP2263040B1 - Verfahren und vorrichtung zur steuerung der zufuhr eines brenngases in einen brenner - Google Patents
Verfahren und vorrichtung zur steuerung der zufuhr eines brenngases in einen brenner Download PDFInfo
- Publication number
- EP2263040B1 EP2263040B1 EP09723221.9A EP09723221A EP2263040B1 EP 2263040 B1 EP2263040 B1 EP 2263040B1 EP 09723221 A EP09723221 A EP 09723221A EP 2263040 B1 EP2263040 B1 EP 2263040B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- membrane
- pipe
- load
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/007—Regulating fuel supply using mechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/20—Membrane valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7781—With separate connected fluid reactor surface
- Y10T137/7784—Responsive to change in rate of fluid flow
- Y10T137/7787—Expansible chamber subject to differential pressures
- Y10T137/7788—Pressures across fixed choke
Definitions
- the present invention relates to a method for controlling the feed of a combustible gas to a burner apparatus, according to the features stated in the preamble of Claim 1 which is the principal claim.
- the invention also relates to a valve device operating by the aforesaid method.
- JP 62073010 is also prior art to the present invention.
- the invention is particularly, but not exclusively, applicable to the field of valve devices designed to feed a flow of gas which can be regulated in a particularly accurate and precise way, where there is a requirement to provide rather extensive modulation of the range of feed flow rates.
- An example of a typical application of this type is a heat and power generating system based on the use of fuel cells. In these systems, heat is generated by processes of combustion of combustible mixtures, and the gas is also converted directly to electrical energy by electrochemical processes in the fuel cells. In these processes, the flow rate of the combustible gas (such as natural or liquid gas) has to be regulated accurately, especially at the minimum flow rates required in the desired modulation range.
- the outlet pressure can also be subject to fluctuations which are difficult to control.
- the outlet cross section is made to communicate with the restricted section of a Venturi tube, provided to mix the gas fed by the valve with air or other air-like substances
- the feed pressure of the valve device may be subject to fluctuations which can have a significant effect on the feed flow rate.
- the fundamental problem of the present invention is that of providing a method and a device whose structural and functional design is such that the limitations of the aforementioned prior art can be overcome.
- the number 1 indicates the whole of a valve device for controlling the feed of a combustible gas (referred to below simply as "gas"), made according to the prior art.
- the device comprises a feed passage 2 for conveying the gas from a feed element to a burner apparatus (neither of which is shown), this passage extending between a gas inlet section 3 and a gas outlet section 4.
- the passage has a narrowed cross section, for example in the form of a nozzle 4a.
- the nozzle 4a is made to be connected to the restricted cross section 5 of a Venturi tube system 6 along which a flow of an air-like medium, for example vapour, is provided, in order to mix these fluids and create a suitable mixture for supplying a fuel cell unit 7, only shown schematically, in which electrical energy is generated directly by an electrochemical process.
- This system can be integrated into heating apparatus such as boilers, including those for domestic use, which have combined systems for producing heat by conventional gas combustion processes and for producing electrical energy by electrochemical processes of the aforementioned type.
- valve seat 8 In the pipe 2 there is formed a valve seat 8, interacting with a plug 9 whose operating rod 10 is connected rigidly to a membrane 11 for operating the valve.
- the pipe 2 Downstream of the valve 8 with respect to the direction of flow, the pipe 2 has a constriction 12 or other similar narrowing of the cross section of the pipe, with a predetermined width, such that a pressure drop is created across the constriction.
- Pu indicates the pressure upstream of the constriction, corresponding to the pressure downstream of the plug 9.
- Pe indicates the pressure downstream of the constriction 12, the pressure difference across the constriction, indicated by Dp, being equal to Pu - Pe.
- Pi indicates the pressure of the gas at the inlet of the pipe 2, which depends on the mains supply conditions.
- One side of the membrane 11, indicated by 11a, is also subjected to the pressure Pu downstream of the plug 9, while the other side, indicated by 11b, is subjected to the pressure Pe, the signal formed by this pressure being communicated through a connecting pipe 13 extending between a section of the pipe 2 downstream of the constriction (in the region between the constriction and the nozzle) and a chamber 14 which is partly delimited by the membrane 11, as clearly shown in Figure 1 .
- the side 11b of the membrane is also subjected to an resilient load F created by a spring 15, whose opposite axial ends 15a and 15b are connected, respectively, to the membrane 11 and to a fixed wall 14a of the chamber 14.
- valve device described above can also comprise means for returning the plug 9 to the condition in which the valve seat 8 is closed, for example resilient means such as a spring (not shown in Figure 1 ).
- the feed flow rate Q which is regulated by adjusting the resilient load F, can advantageously be controlled independently of the absolute pressure levels present in the inlet section (Pi) and in the outlet section (Pu) of the pipe 2. Since, in particular, the inlet pressure Pi, determined by the mains supply conditions, may be subject to fluctuations which may be significant and not easily controllable, the method enables the flow rate Q to be regulated accurately and independently of the pressure Pi.
- Figure 2 shows an example of a valve device operating according to the method of the invention, in which elements similar to those of the previous example are identified by the same reference numerals.
- valve device is made in the form of a servo valve, and a control circuit branched from the pipe 2 is provided for the servo-assisted operation of the main valve (the plug 9).
- the side 11b of the membrane delimits a control chamber 14 which communicates with the main pipe 2, upstream of the valve seat 8, through a control pipe 16.
- the section of the pipe 16 which connects this pipe to the chamber 14 is selectively opened or closed by the plug of a solenoid valve 17, designed for the servo-assisted operation of the main valve 8.
- the number 18 indicates a constriction in the pipe 16.
- the control chamber 14 is connected to the outlet section 4 of the pipe 2, downstream of the constriction 12, through a discharge pipe 19 on which a pressure regulator device, indicated as a whole by 20, is provided.
- a pressure regulator device indicated as a whole by 20
- This is a membrane-type pressure regulator 21, of a conventional type, in which one side of a membrane delimits a control chamber 22 which communicates, through part 19a of the pipe 19, with the outlet section 4, and which can also shut off the outlet section of the other part 19b of the pipe 19 communicating with the control chamber 14.
- the opposite side of the membrane is biased by a calibration spring 23 housed in a chamber 24, which is connected through a pipe 25 to a section of the pipe 2 upstream of the constriction 12.
- the regulator 20 is designed to react to the variations in the feed pressure and to compensate for these, and also to return the pressure to a calibrated value predetermined by regulating the load F' of the spring 23.
- the opening and closing of the main valve seat 8 is controlled by means of the servo-assistance circuit operated by the solenoid valve 17.
- the feed flow rate Q which is regulated by adjusting the resilient load F', can advantageously be controlled independently of the absolute pressure levels present in the inlet section (Pi) and in the outlet section (Pu) of the pipe 2.
- the feed flow rate is controlled in such a way that it is substantially a function of the pressure difference across the predetermined constriction.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feeding And Controlling Fuel (AREA)
- Fluid-Driven Valves (AREA)
- Regulation And Control Of Combustion (AREA)
- Safety Valves (AREA)
Claims (4)
- Verfahren zum Steuern der Zuführung eines brennbaren Gases mittels einer Ventilvorrichtung, die in einer Zuführleitung (2) angeordnet ist, die einen Gaseinlassabschnitt (3) und einen Gasauslassabschnitt (4) aufweist, wobei die Vorrichtung einen Ventilsitz (8) in der Leitung, die mit einem Membran-betätigten Stopfen (9) verbunden ist, und eine Vorrichtung zum Zurückführen des Stopfens (9) zu einer Position aufweist, in der der Ventilsitz (8) abgeschaltet ist, wobei das Verfahren die folgenden Schritte aufweist:- Erzeugen einer Druckdifferenz (Dp) in einem Abschnitt des Rohrs (2) stromabwärts des Stopfens (9) bezüglich der Fließrichtung mittels einer Verengung (12) in der Leitung mit einem vorbestimmten Querschnitt, wobei die Druckdifferenz (Dp) durch einen ersten Druck (Pu) stromaufwärts der Verengung und einen zweiten Druck (Pe) stromabwärts der Verengung (12) definiert ist,- Erfassen des Signals, dass durch den zweiten Druck (Pe) stromabwärts der ersten Verengung (12) gebildet wird, und Wirken des zweiten Drucks auf die Seite der Membran, die der gegenüberliegt, auf die der erste Druck (Pu) wirkt,- Erzeugen einer regelbaren Last (F; F') auf die Membran des MembranBetätigungssystems, wobei diese Last von den ersten und zweiten Drücken (Pu, Pe) unabhängig ist, so dass die Druckdifferenz (Dp) durch Regulieren der Last (F, F'), die auf die Membran wirkt, reguliert werden kann, wobei die Last proportional mit der Differenz derart korreliert wird, dass die Durchflussmenge (Q) des Gases, das dem Auslassabschnitt (4) zugeführt wird, die eine Funktion der Druckdifferenz (Dp) ist, unabhängig von den Druckniveaus gesteuert wird, die im Einlassabschnitt (3) und im Auslassabschnitt (4) der Leitung (2) vorhanden sind,dadurch gekennzeichnet, dass die Ventilvorrichtung in der Form eines Servoventils hergestellt ist, und dadurch, dass das Verfahren die folgenden Schritte umfasst:- Erfassen der Signale, die durch die ersten und zweiten Drücke (Pu, Pe) über die Verengung (12) gebildet werden, mittels entsprechender Leitungen, und Aufbringen der Drücke auf gegenüberliegende Seiten einer zweiten Membran (21) eines Druckreglers (20), der in einen Steuerkreis des Servoventils eingepasst ist,- Erzeugen der regelbaren Last (F') auf die zweite Membran (21) des Druckreglers, unabhängig von den ersten und zweiten Drücken, nur in der Weise, dass die Druckdifferenz (Dp) durch Regulieren der Last, die auf die zweite Membran (21) wirkt, reguliert werden kann, wobei die Last proportional mit der Druckdifferenz in der Weise korreliert wird, dass die Durchflussmenge (Q) des Gases, das dem Auslassabschnitt (4) zugeführt wird, welche eine Funktion der Druckdifferenz ist, unabhängig von den Absolutdruckniveaus gesteuert wird, die im Einlassabschnitt (3) und im Auslassabschnitt (4) der Leitung (2) vorhanden sind.
- Verfahren gemäß Anspruch 1, in dem ein Signal, das durch einen Steuerdruck der Servoschaltung gebildet wird, in einem Abschnitt (16) der Leitung stromaufwärts des Ventilsitzes (8) erfasst wird, wobei das Signal zu einer Steuerkammer (14) geführt wird, die zumindest teilweise durch die Betätigungsmembran (11) begrenzt ist, die mit dem Ventilsitz verbunden ist, und wobei die Steuerkammer (14) mit dem Druckregler (20) in Kommunikation steht, wodurch der Steuerdruck zur Seite der Membran (21) des Reglers (20) aufgebracht wird, der mit dem zweiten Druck (Pe) verbunden ist.
- Verfahren gemäß Anspruch 2, in dem die erzeugte Last (F'), die mit der entsprechenden Membran verbunden ist, derart moduliert wird, dass die Druckdifferenz (Dp) und die Zuführdurchflussmenge (Q) im Auslassabschnitt (4) in einer proportionalen Korrelation mit der Änderung der Last (F') moduliert werden kann.
- Ventilvorrichtung zum Steuern der Zufuhr eines brennbaren Gases mit einer Gas-Hauptzuführleitung (2), die einen Einlassabschnitt (3) und einen Auslassabschnitt (4) aufweist, mit einem Ventilsitz (8), der in der Leitung vorgesehen und mit einem Membranbetätigten Stopfen (9) verbunden ist, und mit einer Einrichtung zum Zurückführen des Stopfens zu einer Position, in der der Ventilsitz (8) abgeschaltet ist, wobei die Vorrichtung ferner aufweist:- eine Verengung (12) in der Leitung (2) mit einem vorbestimmten Querschnitt stromabwärts des Stopfens (9) bezüglich der Fließrichtung, so dass eine Druckdifferenz (Dp) über die Verengung (12) erzeugt wird, wobei diese Differenz durch einen ersten Druck (Pu) stromaufwärts der Verengung (12) und einen zweiten Druck (Pe) stromabwärts davon definiert wird,- eine zweite Leitung (13; 19) zum Verbinden eines Abschnitts der Hauptleitung stromabwärts der Verengung mit einer Kammer (14), die durch die Membran begrenzt wird, so dass der zweite Druck auf die Seite der Membran der Kammer (14) wirkt, die der Seite gegenüberliegt, auf die der erste Druck (Pu) wirkt,- eine Einrichtung zum Erzeugen einer regelbaren Last (F; F') auf die Membran des Membranbetätigungssystems, so dass die Druckdifferenz (Dp) durch Regulieren der Last reguliert werden kann und proportional mit der Last korreliert wird, um das Gas dem Auslassabschnitt (4) mit einer Durchflussmenge (Q) zuzuführen, die eine Funktion der Differenz (Dp) ist und die unabhängig von den Druckniveaus, die im Einlassabschnitt (3) und im Auslassabschnitt (4) der Leitung vorhanden sind, gesteuert wird,dadurch gekennzeichnet, dass- die Vorrichtung in der Form eines Servoventils hergestellt ist und einen Regelkreis des Servoventils und ein Membrantyp-Druckregler (20), der im Regelkreis vorgesehen ist, aufweist, wobei Leitungen (25, 19a) vorgesehen sind, um die ersten und zweiten Drücke (Pu, Pe), die stromaufwärts und stromabwärts der Verengung (12) vorhanden sind, auf die jeweiligen Seiten der Membran (21) des Reglers (20) aufzubringen, wobei die Einrichtung zum Erzeugen einer Last nur auf die Membran (21) des Reglers wirkt, so dass die Druckdifferenz (Dp) durch Regulieren der Last (F'), die auf die Membran (21) des Druckreglers (20) wirkt, gesteuert wird, um eine Zuführ-Durchflussmenge (Q) im Auslassabschnitt (4) vorzusehen, die eine Funktion der Druckdifferenz (Dp) ist und die unabhängig von den einzelnen Druckniveaus gesteuert wird, die im Einlassabschnitt (3) und im Auslassabschnitt (4) der Hauptleitung (2) vorhanden sind.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000088A ITPD20080088A1 (it) | 2008-03-19 | 2008-03-19 | Metodo e dispositivo per il controllo della erogazione di un gas combustibile, verso un apparecchio bruciatore |
PCT/EP2009/052550 WO2009115411A2 (en) | 2008-03-19 | 2009-03-04 | A method and a device for controlling the feed of a combustible gas to a burner apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2263040A2 EP2263040A2 (de) | 2010-12-22 |
EP2263040B1 true EP2263040B1 (de) | 2018-04-11 |
Family
ID=40293081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09723221.9A Not-in-force EP2263040B1 (de) | 2008-03-19 | 2009-03-04 | Verfahren und vorrichtung zur steuerung der zufuhr eines brenngases in einen brenner |
Country Status (5)
Country | Link |
---|---|
US (1) | US8579627B2 (de) |
EP (1) | EP2263040B1 (de) |
AU (1) | AU2009226852B2 (de) |
IT (1) | ITPD20080088A1 (de) |
WO (1) | WO2009115411A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2013200950B2 (en) | 2012-02-16 | 2014-05-29 | David M. Christensen | Control system for space heater/hearth |
US9528712B2 (en) * | 2012-11-05 | 2016-12-27 | Pat Caruso | Modulating burner system |
DE102021125215A1 (de) | 2021-09-29 | 2023-03-30 | Vaillant Gmbh | Verfahren zum Betreiben eines Heizgerätes, Computerprogramm, Speichermedium, Regel- und Steuergerät, Heizgerät und Verwendung eines Steuerventils |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1328265A (en) * | 1969-10-25 | 1973-08-30 | Nissan Motor | Hydraulic brake system for a vehicle |
JPS6273010A (ja) * | 1985-09-26 | 1987-04-03 | Aisin Seiki Co Ltd | 燃焼制御装置 |
US4802507A (en) * | 1987-01-02 | 1989-02-07 | Kidde, Inc. | Gas flow control device |
WO2005024302A1 (en) * | 2003-09-08 | 2005-03-17 | Sit La Precisa S.P.A. | A system for controlling the delivery of a fuel gas to a burner apparatus |
CA2630767A1 (en) * | 2005-11-23 | 2007-05-31 | Sit La Precisa S.P.A. | Device for controlling the delivery of a combustible gas to a burner apparatus |
-
2008
- 2008-03-19 IT IT000088A patent/ITPD20080088A1/it unknown
-
2009
- 2009-03-04 EP EP09723221.9A patent/EP2263040B1/de not_active Not-in-force
- 2009-03-04 WO PCT/EP2009/052550 patent/WO2009115411A2/en active Application Filing
- 2009-03-04 US US12/921,836 patent/US8579627B2/en not_active Expired - Fee Related
- 2009-03-04 AU AU2009226852A patent/AU2009226852B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
US20110003260A1 (en) | 2011-01-06 |
WO2009115411A3 (en) | 2010-12-16 |
EP2263040A2 (de) | 2010-12-22 |
US8579627B2 (en) | 2013-11-12 |
ITPD20080088A1 (it) | 2009-09-20 |
AU2009226852A1 (en) | 2009-09-24 |
AU2009226852B2 (en) | 2013-09-19 |
WO2009115411A2 (en) | 2009-09-24 |
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